Journal
ADVANCED ENGINEERING MATERIALS
Volume 19, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201600617
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Funding
- BMBF [2A67/03 N 9040]
- State of Saarland
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The authors develop a protective transparent coating of aluminum oxide through direct oxidation of aluminum-coated glass. Aluminum coatings are deposited on low-iron glass substrates using a physical deposition method and then oxidized at different temperatures. A uniform nano-porous structure with grain sizes of approximately 30-80 nm is observed. X-ray diffraction, TEM images, and EDX analysis indicate the formation of crystalline gamma-Al2O3, Si, and stishovite-SiO2 as a result of interdiffusion. The samples treated at different temperatures have hardness values ranging from 5 to 9H, which is within the desirable range for industrial scratch-resistant coatings. The optical transmission of around 75-85% at visible wavelengths makes the proposed technique useful for the design of protective transparent coatings.
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